WO2020171095A1 - Circuit de filtre d'interférence électromagnétique - Google Patents

Circuit de filtre d'interférence électromagnétique Download PDF

Info

Publication number
WO2020171095A1
WO2020171095A1 PCT/JP2020/006386 JP2020006386W WO2020171095A1 WO 2020171095 A1 WO2020171095 A1 WO 2020171095A1 JP 2020006386 W JP2020006386 W JP 2020006386W WO 2020171095 A1 WO2020171095 A1 WO 2020171095A1
Authority
WO
WIPO (PCT)
Prior art keywords
primary winding
electromagnetic interference
filter circuit
common mode
interference filter
Prior art date
Application number
PCT/JP2020/006386
Other languages
English (en)
Japanese (ja)
Inventor
立宇 戴
文潔 陳
明華 鄭
Original Assignee
オムロン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by オムロン株式会社 filed Critical オムロン株式会社
Priority to JP2021502057A priority Critical patent/JP7103505B2/ja
Publication of WO2020171095A1 publication Critical patent/WO2020171095A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/09—Filters comprising mutual inductance
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Definitions

  • the present invention relates to the field of electric power electronics, and particularly to a common mode choke coil and an electromagnetic interference filter circuit.
  • Electric power equipment connected to the electric power network may cause electromagnetic interference (Electro-Magnetic-Interference, EMI) during use.
  • the electromagnetic interference can adversely affect the normal operation of the power network. Therefore, the electric power equipment connected to the electric power network must meet the requirements of the conducted electromagnetic interference regulations specified in the area where the electric power network exists.
  • Commonly used conduction electromagnetic interference filters include passive electromagnetic interference filters, active electromagnetic interference filters, and hybrid passive and active electromagnetic interference filters.
  • the passive electromagnetic interference filter is widely applied as a device that suppresses the influence of electromagnetic interference due to the use of electrical equipment on the power network.
  • size reduction, weight reduction, and integration in device design there is an increasing demand for size reduction, weight reduction, and integration in device design.
  • the disadvantages of the passive electromagnetic interference filter such as large volume, heavy weight, and low suppression effect, are becoming noticeable. It has become.
  • the active electromagnetic interference filter and the hybrid electromagnetic interference filter can significantly reduce the volume and weight as compared with the conventional passive electromagnetic interference filter, and can obtain the same or better filtering effect. It is highly regarded by the industry and is recognized as the best alternative to traditional passive electromagnetic interference filters.
  • the hybrid electromagnetic interference filter is configured so as to take advantage of both of the active electromagnetic interference filter and the passive electromagnetic interference filter and to avoid the disadvantages thereof. It is more widely applied and has potential in the future than active electromagnetic interference filters.
  • the inventor of the present application clarified the following by conducting research and research. That is, from the time when the concept of the hybrid electromagnetic interference filter was disclosed to the present, the circuit of the active filter portion and the circuit of the passive filter portion that constitute the hybrid electromagnetic interference filter operate independently of each other, and the circuit is physically , And thus the volume of the hybrid filter is the sum of the volume of the active filter portion and the volume of the passive filter portion. Therefore, the volume of the hybrid filter is still large.
  • a common mode choke coil and an electromagnetic interference filter circuit are provided as an example of an embodiment of the present invention.
  • the common mode choke coil since the number of turns of the primary winding is large, the primary winding can exert a function of suppressing common mode interference, while the secondary winding has a function of detecting an electromagnetic interference signal. It can be exerted and the detected signal can be used for active electromagnetic interference filtering. Therefore, the common mode choke coil has integrated dual functions of common mode interference suppression and signal detection. Therefore, by using the common mode choke coil, the passive filter circuit and the active filter circuit can be easily integrated, and the electromagnetic interference filter can be downsized. Further, since the inductance is connected in series to the secondary winding of the common mode choke coil, the high frequency characteristics of the common mode choke coil are improved by the inductance.
  • a common mode choke coil is provided as an example of an embodiment of the present invention.
  • the common mode choke coil includes a first primary winding, a second primary winding, and a secondary winding, and the secondary winding includes the first primary winding and the second primary winding. and electromagnetically coupled with the primary winding, the common mode choke coil, further, a first resistor connected in series to both ends of the secondary winding (R CT) and the first inductance (L a) And the number of turns of the first primary winding is set to be larger than that of the secondary winding, and the number of turns of the second primary winding is set to be larger than that of the secondary winding. Has been done.
  • the number of turns of the first primary winding is 2 or more, and the number of turns of the second primary winding is 2 or more.
  • the first inductance (L a ) has a hollow coil structure or a structure in which a printed circuit board is covered with copper.
  • the number of turns of the first primary winding is the same as the number of turns of the second primary winding.
  • the winding directions of the first primary winding and the second primary winding are opposite to each other, and the winding direction of the secondary winding is the first winding.
  • the winding direction of either one of the primary winding and the second primary winding is the same.
  • the common mode choke coil further has a magnetic core, and the first primary winding, the second primary winding, and the secondary winding have the magnetic field. It is wrapped around the core.
  • An electromagnetic interference filter circuit is provided as an example of an embodiment of the present invention.
  • the electromagnetic interference (EMI) filter circuit one end of the first primary winding of the common mode choke coil is connected to a first output end of an impedance stabilization network, and the second of the common mode choke coil is connected.
  • One end of the primary winding is connected to the second output end of the impedance stabilization network, and the other end of the first primary winding and the other end of the second primary winding are respectively power input ends of the utility equipment.
  • a common mode choke coil according to any one of the aspects of the present invention, which is configured to be connected to, and two input terminals are respectively connected to both ends of the secondary winding of the common mode choke coil,
  • An operational amplifier configured to output a compensation signal from an output terminal and having a feedback resistor (R f ) connected between the output terminal and the input terminal; and the other end of the first primary winding.
  • R f feedback resistor
  • a resistor and a capacitor connected in series with the other end of the second primary winding, connected to the output end of the operational amplifier, and based on the compensation signal, the first primary winding and A current injection network configured to inject current into the second primary winding.
  • the electromagnetic interference filter circuit further comprises a compensation capacitor (C f), the compensation capacitor (C f) and the said feedback resistance (R f) are connected in parallel.
  • the current injection network includes a first capacitor (C 1 ), a second resistor (R 1 ), and a third resistor (R 2 ) which are sequentially connected in series. And a second capacitor (C 2 ), and the output terminal of the operational amplifier is connected to a connection node between the second resistor (R 1 ) and the third resistor (R 2 ). ..
  • the two input terminals of the operational amplifier are connected to the secondary winding of the common mode choke coil via a third resistor (R g ) and a fourth resistor (R s ) respectively. Connected to both ends of the wire.
  • the present invention by setting a large number of turns of the primary winding of the common mode choke coil, it is possible to realize both the detection function and the common mode interference suppression function. Therefore, the active filter and the passive filter are integrated. It is advantageous in that the size of the filter can be reduced. Furthermore, by connecting an inductance in series to the secondary winding of the common mode choke coil, the high frequency characteristics of the common mode choke coil can be improved.
  • the term "comprising/comprising” refers to the presence of a feature, an overall configuration, a procedure, or a component, excluding the presence or addition of one or more other features, overall configurations, procedures, or components. do not do.
  • FIG. 1 is a diagram showing a configuration of a common mode choke coil according to the first embodiment of the present invention.
  • FIG. 2 is an equivalent circuit constructed for the signal detection function of the common mode choke coil according to the first embodiment of the present invention.
  • FIG. 3 is an equivalent circuit constructed for the common mode interference suppression function of the common mode choke coil according to the first embodiment of the present invention.
  • FIG. 4 is a diagram showing the configuration of the electromagnetic interference filter circuit according to the second embodiment of the present invention.
  • FIG. 5 is a graph of simulation results showing the filtering effect of the electromagnetic interference filter circuit according to the second embodiment of the present invention.
  • the terms “first”, “second”, etc. are used to distinguish the names of different elements, and represent the spatial arrangement or temporal order of these elements. These elements are not limited to the above terms as they have no meaning.
  • the term “and/or” includes any one and all combinations of one or more of the associated listed terms.
  • the terms “comprising,” “including,” “having,” etc. refer to the presence of the listed features, elements, elements, or packages, and excludes the presence or addition of one or more other features, elements, elements, or packages. Not something to do.
  • Embodiment 1 provides a common mode choke coil.
  • FIG. 1 is a diagram showing the configuration of the common mode choke coil of this embodiment.
  • the common mode choke coil 10 has a first primary winding 11, a second primary winding 12, and a secondary winding 13.
  • the secondary winding 13 is electromagnetically coupled with the first primary winding 11 and the second primary winding 12.
  • the number of turns of the first primary winding 11 is N 1
  • the number of turns of the second primary winding 12 is N 2
  • the number of turns of the secondary winding 13 is Ns.
  • N 1 is set to be larger than Ns
  • N 2 is also set to be larger than Ns.
  • the common mode choke coil 10 of the present embodiment since the first primary winding 11 and the second primary winding 12 have a large number of turns, it is possible to exert the function of suppressing common mode interference. Since the secondary winding 13 is electromagnetically coupled to the first primary winding 11 and the second primary winding 12, the secondary winding 13 can exert a function of detecting an electromagnetic interference signal. The detected signal can be used for active electromagnetic interference filtering. Therefore, the common mode choke coil 10 has an integrated dual function of common mode interference suppression and signal detection, which is advantageous for integration of a passive filter circuit and an active filter circuit, and downsizing of the electromagnetic interference filter. Is realized.
  • the number of turns of the first primary winding 11 and the second primary winding 12 is set to be large and a drastic change in magnetic flux can be generated, even when the number of turns of the secondary winding 13 is relatively small. , The detection signal used in the active electromagnetic interference filter can be sufficiently obtained.
  • a high transformation ratio is formed between the first primary winding 11 and the second primary winding 12 and the secondary winding 13. Therefore, it is possible to provide a high gain to the electromagnetic interference filter circuit including the common mode choke coil 10.
  • the number of turns N 1 of the first primary winding 11 is, for example, 2 or more, and the number of turns N 2 of the second primary winding 12 is 2 or more.
  • the first primary winding 11 and the second primary winding 12 can exert a common mode interference suppression effect, and the secondary winding 13 can obtain a sufficient detection signal with a small number of turns. it can.
  • a first resistor R CT and a first inductance L a are connected in series at both ends of the secondary winding 13 of the common mode choke coil 10.
  • the first inductance L a can realize the phase shift adjustment and impedance matching of both ends (that is, the detection end) of the secondary winding 13, and the high frequency generated when the number of turns of the secondary winding 13 is small.
  • the adverse effect of parasitic capacitance can be suppressed and the high frequency characteristics of the common mode choke coil can be improved.
  • the common mode choke coil 10 of the present embodiment the number of turns of the first primary winding 11 and the second primary winding 12 is large, whereas the number of turns of the secondary winding 13 is small, resulting in high conversion. A ratio can be formed, and a high gain can be provided to the electromagnetic interference filter circuit including the common mode choke coil 10. Further, since the number of turns of the secondary winding 13 is small, the high frequency parasitic capacitance generated in the secondary winding 13 increases, which may adversely affect the high frequency characteristics of the common mode choke coil 10. However, since the adverse effect is eliminated by the first inductance L a which is connected in series with the secondary winding 13, the common mode choke coil 10 of the present embodiment has still good high frequency characteristics ..
  • the common mode choke coil 10 of the present embodiment is characterized in that the number of turns of the first primary winding 11 and the second primary winding 12 is large, whereas the number of secondary windings 13 is small.
  • the secondary winding 13 is characterized in that the first inductance L a is connected in series, the electromagnetic interference filter circuit can be downsized, and the high conversion ratio can be achieved. Therefore, it is possible to provide a high gain to the electromagnetic interference filter circuit, and further, it has excellent high frequency characteristics.
  • the number of turns N 1 of the first primary winding 11 may be the same as the number of turns N 2 of the second primary winding 12. Thereby, the first primary winding 11 and the second primary winding 12 can suppress the common mode interference more effectively.
  • the first primary winding 11 and the second primary winding 12 have the same winding direction. Thereby, the effect of suppressing common mode interference can be exhibited.
  • the common mode choke coil 10 may further include a magnetic core 14, and the magnetic core 14 has a first primary winding 11 and a second primary winding 11.
  • the winding 12 and the secondary winding 13 may be wound around.
  • the secondary winding 13 can be electromagnetically coupled with the first primary winding 11 and the second primary winding 12.
  • the winding position of the secondary winding 13 on the magnetic core 14 may be between the first primary winding 11 and the second primary winding 12.
  • the magnetic core 14 may be formed in a closed shape.
  • the magnetic core 14 has a closed ring shape.
  • the present embodiment is not limited to this, and the magnetic core 14 may have another shape.
  • the magnetic core 14 may have an open ring shape or a rod shape.
  • the first inductance L a may have a hollow coil structure or a structure in which a printed circuit board is covered with copper. As a result, the space occupied by the first inductance L a is reduced, and particularly when the first inductance L a has a structure in which the printed circuit board is covered with copper, the first inductance L a has an extra space. Since it does not occupy, the size of the filter circuit using the common mode choke coil 10 can be reduced.
  • the inductance values of the first primary winding 11, the second primary winding 12 and the secondary winding 13 are L 1 , L 2 and L CT , respectively.
  • the first primary winding 11 and the second primary winding 12 may each be connected to a main circuit.
  • the main circuit may be an AC power supply or may be a line impedance stabilization network connected to the AC power supply.
  • the common mode choke coil 10 in the present embodiment can realize two functions of signal detection and common mode interference suppression, and hereinafter, equivalent circuits are constructed for the two functions.
  • the first primary winding 11 and the second primary winding 12 having the same number of turns are connected to the main circuit, and the common mode noise current is the same as the first primary winding 11 and the first primary winding 11.
  • a signal is generated in the secondary winding 13 by causing the magnetic core 14 to generate magnetic flux in the same direction by flowing through the two primary windings 12, and at the same time, the magnetic fluxes generated by the differential mode noise currents cancel each other out. It has become.
  • FIG. 2 is an equivalent circuit constructed for the signal detection function of the common mode choke coil in this embodiment.
  • FIG. 2 is a simplified model in which the current flowing through the first primary winding 11 and the second primary winding 12 is equivalently converted into the secondary winding 13 based on the common mode signal detection principle.
  • n 2 C p is an equivalent capacitance value obtained by converting the parasitic capacitance C p of the first primary winding 11 and the second primary winding 12 into the secondary winding 13.
  • L CT is the inductance of the secondary winding 13.
  • R CT and L a are the resistance value of the first resistance and the inductance value of the first inductance connected to the secondary winding 13, respectively.
  • the transfer function G CT (s) for signal detection can be derived based on the simple model shown in FIG.
  • the transfer function is as shown in Equation 1 below.
  • ni indicates a current signal detected by the secondary winding 13
  • V R indicates a voltage signal obtained by conversion.
  • FIG. 3 is an equivalent circuit constructed for the common mode interference suppression function of the common mode choke coil of this embodiment.
  • L 3 corresponds to L CT in FIG.
  • the inductances L 1 and L 2 are the same and distributed symmetrically, the three windings 11, 12 and 13 are completely coupled, and the coupling coefficient k is 1.
  • FIG. 3B shows equivalent common mode impedances Z CM1 and Z CM2 of the common mode choke coil 10 of FIG.
  • Z CM1 and Z CM2 have the same value and can provide a common mode interference suppression function.
  • Z CM1 and Z CM2 represent the equivalent common mode impedances of the first primary winding 11 and the second primary winding 12, respectively.
  • the arrow on the dotted line indicates the direction of the common mode current
  • I CM indicates the equivalent common mode interference current source.
  • i CM indicates the common mode interference current
  • the dotted arrow 101 indicates the direction of the common mode current.
  • the number of turns of the primary winding is large, whereas the number of turns of the secondary winding is small, so that the common mode interference in the primary winding is suppressed, and a sufficient detection signal is obtained. It is possible to obtain the effect that the primary winding and the secondary winding have a high conversion ratio. Therefore, the passive filter and the active filter can be easily integrated, and the system can obtain a higher gain. Furthermore, since the inductance is connected in series to the secondary winding, it is possible to realize phase shift adjustment and impedance matching at the detection end, and the adverse effect on high-frequency parasitic capacitance due to the small number of turns of the secondary winding. Can be suppressed and the high frequency characteristics can be improved. Therefore, the common mode choke coil according to the present embodiment can not only realize the miniaturization of the electromagnetic interference (EMI) filter but also obtain good high frequency characteristics and high gain.
  • EMI electromagnetic interference
  • Embodiment 2 provides an electromagnetic interference (EMI) filter circuit.
  • the electromagnetic interference filter circuit includes the common mode choke coil 10 described in the first embodiment.
  • FIG. 4 is a diagram showing the configuration of the electromagnetic interference filter circuit of this embodiment.
  • the electromagnetic interference filter circuit 40 includes the common mode choke coil 10, an operational amplifier 41, and a current injection network 42.
  • the common mode choke coil 10 is the common mode choke coil described in the first embodiment, and the description regarding the common mode choke coil 10 in the first embodiment is incorporated.
  • one end 111 of the first primary winding 11 of the common mode choke coil 10 is connected to the first output end 401 of the impedance stabilization network (LISN) 400, and the second primary winding 11 is connected.
  • One end 121 of 12 is connected to the second output end 402 of the impedance stabilization network 400, and the other end 112 of the first primary winding 11 and the other end 122 of the second primary winding 12 are respectively used for utility. It is connected to the power input ends 301 and 302 of the facility 300.
  • the operational amplifier 41 is configured such that two input terminals 411 and 412 are respectively connected to both ends of the secondary winding 13 of the common mode choke coil 10 and a compensation signal is output from the output terminal 413. ing.
  • a feedback resistor R f is connected between the output terminal 413 and the input terminal 411 of the operational amplifier 41.
  • the input end 411 is, for example, the in-phase input end of the operational amplifier 41
  • the input end 412 is, for example, the anti-phase input end of the operational amplifier 41.
  • the two input terminals 411 and 412 of the operational amplifier 41 are connected to the two ends of the common mode choke coil 10 via the third resistance R g and the fourth resistance R s , respectively.
  • the secondary winding 13 is connected to the both ends.
  • the current injection network 42 includes a resistor and a capacitor connected in series between the other end 112 of the first primary winding 11 and the other end 122 of the second primary winding 12. Good.
  • the current injection network 42 is connected to the output terminal 413 of the operational amplifier 41, and injects a current into the first primary winding 11 and the second primary winding 12 based on the compensation signal output from the output terminal 413. To do.
  • the current injection network 42 includes a first capacitor C 1 , a second resistor R 1 , a third resistor R 2, and a third resistor R 2 , which are sequentially connected in series. Two capacitors C 2 may be provided.
  • the output terminal 413 of the operational amplifier 41 is connected to the node 421 between the second resistor R 1 and the third resistor R 2 .
  • the electromagnetic interference filter circuit 40 further includes a compensation capacitor C f .
  • the compensation capacitor C f is connected in parallel with the feedback resistor R f .
  • the compensation capacitor C f which is connected in parallel with the feedback resistor R f , can improve the phase margin of the electromagnetic interference filter circuit 40 having the advanced phase and change the open loop frequency characteristic of the electromagnetic interference filter circuit 40. Therefore, it is ensured that the active filtering function of the electromagnetic interference filter circuit 40 operates stably, and high attenuation of conducted electromagnetic interference is realized.
  • the power supply equipment 300 is an electromagnetic interference source, and the impedance stabilization network (LISN) 400 provides a standard impedance of 50 ⁇ as a load of the electromagnetic interference filter circuit 40. May be configured to do so.
  • the electromagnetic interference filter circuit 40 includes a portion of a passive electromagnetic interference filter and a portion of an active electromagnetic interference filter. Since the first primary winding 11 and the second primary winding 12 of the common mode choke coil 10 have equivalent common mode impedance, they can be used as passive electromagnetic interference filters.
  • the active electromagnetic interference filter includes an operational amplifier 41, a current injection network 42, and a resistor and a capacitor connected to the operational amplifier 41.
  • the output terminal 413 of the operational amplifier 41 suppresses electromagnetic interference by injecting the currents i c1 and i c2 into the first primary winding 11 and the second primary winding 12 via the current injection network, The influence of the electromagnetic interference of the electric equipment 300 on the electric power network is prevented.
  • the electromagnetic interference filter circuit since the electromagnetic interference filter circuit includes the common mode choke coil described in the first embodiment, it is possible to suppress common mode interference by using the primary winding of the common mode choke coil.
  • an active amplifier can be used to perform active filtering. Therefore, the electromagnetic interference filter circuit of the present embodiment can realize a hybrid function of a passive electromagnetic interference filter function and an active electromagnetic interference filter function with a small volume, and a good electromagnetic interference filtering effect can be obtained.
  • the common mode choke coil has a large number of turns of the primary winding, but has a small number of turns of the secondary winding, and since the inductance is connected in series to the secondary winding, good high frequency characteristics and high Gain can be obtained. Furthermore, since the feedback resistance of the operational amplifier is connected in parallel with the compensation capacitor C f to form advance compensation, the phase margin of the electromagnetic interference filter circuit is improved and the open loop frequency characteristic of the electromagnetic interference filter circuit can be changed. ..
  • a noise source is simulated with a square wave having an amplitude value of 5V, a frequency of 100 kHz, and an impedance of 50 ⁇ .
  • the simulation condition of the present embodiment is not limited to this.
  • the insertion loss of the electromagnetic interference filter circuit 40 can be obtained by comparing the numerical value of the original noise spectrum with the numerical value of the noise spectrum after being added to the electromagnetic interference filter circuit 40. Further, it is possible to judge whether or not the system is stable based on the state of the noise spectrum after being added to the electromagnetic interference filter circuit 40.
  • the original noise is noise of electromagnetic interference before being added to the electromagnetic interference filter circuit 40.
  • the inductance of each winding (that is, L 1 , L 2 , L CT ) in the common mode choke coil, the number of windings of each winding, and the resistance R CT are aimed at ensuring the stabilization of the system and maximization of the filtering effect.
  • the inductance value of the first inductance L a are set.
  • parameters of each element in the electromagnetic interference filter circuit 40 are set, and simulation is performed. Next, the simulation result will be described.
  • FIG. 5 is a graph of simulation results showing the filtering effect of the electromagnetic interference filter circuit of this embodiment.
  • Reference numeral 501 indicates the peak envelope of the original noise spectrum.
  • Reference numeral 502 shows a spectrum of noise after being added to the electromagnetic interference filter circuit of the present embodiment.
  • the electromagnetic interference filter circuit includes a compensation capacitor C f connected in parallel with a feedback resistor and has a common mode.
  • the first inductance L a is connected in series to the secondary winding of the choke coil.
  • Reference numeral 503 represents a spectrum of noise after being added to the electromagnetic interference filter circuit which is the first comparative example, and the electromagnetic interference filter circuit which is the first comparative example is a compensation resistor connected in parallel with the feedback resistor.
  • the first inductance L a is not connected in series to the secondary winding of the common mode choke coil.
  • Reference numeral 504 shows a spectrum of noise after being added to the electromagnetic interference filter circuit which is the second comparative example, and the electromagnetic interference filter circuit which is the second comparative example does not include the compensation capacitor C f.
  • the first inductance L a is connected in series to the secondary winding of the common mode choke coil.
  • the horizontal axis represents frequency, the unit thereof is hertz (Hz), the vertical axis represents noise intensity, and the unit thereof is decibel microvolt (dB ⁇ V).
  • the electromagnetic interference filter circuit of the present embodiment can effectively suppress common mode electromagnetic interference.
  • the intensity of the original noise at a frequency of 1 MHz (10 6 Hz) is 100 dB ⁇ V, while after being added to the electromagnetic interference filter circuit, the noise intensity is reduced to 30 dB ⁇ V as shown in spectrum 502. There is. That is, the electromagnetic interference filter circuit of this embodiment can attenuate the intensity of electromagnetic noise by about 70 dB ⁇ V. Therefore, this simulation result verifies the feasibility and practicality of the electromagnetic interference filter circuit of the present embodiment.
  • the electromagnetic interference filter circuit of the present embodiment includes the compensation capacitor C f , and therefore the filtering characteristic is also improved.
  • the noise intensity of the spectrum 502 is lower than the noise intensity of the spectrum 504 as a whole, and is extremely low particularly in the high frequency region.
  • the noise intensity of the spectrum 504 is higher than the intensity of the original noise 501. Therefore, without the compensation capacitor C f , the first inductance L a alone is sufficient. The noise cannot be suppressed by the filter circuit in the high frequency band, but the noise is increased.
  • the noise intensity of the spectrum 503 is lower than the noise intensity of the spectrum 504 in the high frequency region, but in the low frequency region, for example, in the frequency band 506 in FIG.
  • the noise intensity of spectrum 503 is higher than the noise intensity of spectrum 504. Therefore, without the first inductance L a , the compensation capacitor C f alone may deteriorate the filtering performance in the low frequency region of the filter circuit as shown in the spectrum 503.
  • the electromagnetic interference filter circuit of the present embodiment includes the compensation capacitor C f and the first inductance L a, and therefore the filtering performance (that is, The noise suppression performance) is significantly improved, and good filtering performance is obtained in both the high frequency region and the low frequency region.
  • the electromagnetic interference filter circuit includes only one of the compensation capacitor C f and the first inductance L a , the filtering performance in the high frequency region or the low frequency region becomes low, and noise is enhanced. It may cause adverse effects.
  • the electromagnetic interference filter circuit can realize a hybrid of the passive electromagnetic interference filtering function and the active electromagnetic interference filtering function in a small volume, so that a good electromagnetic interference filtering effect can be obtained. In addition to having good high frequency characteristics and high gain. Furthermore, since the compensation capacitor C f is connected in parallel to the feedback resistor of the operational amplifier, the open loop frequency characteristic of the electromagnetic interference filter circuit is improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Networks Using Active Elements (AREA)

Abstract

La présente invention concerne une bobine d'arrêt de mode commun et un circuit de filtre d'interférence électromagnétique.　La bobine d'arrêt de mode commun comprend un premier enroulement primaire, un second enroulement primaire et un enroulement secondaire. L'enroulement secondaire est couplé électromagnétiquement au premier enroulement primaire et au second enroulement primaire. La bobine d'arrêt de mode commun est en outre pourvue d'une première résistance et d'une première inductance connectées en série aux deux extrémités de l'enroulement secondaire. Le nombre de spires dans le premier enroulement primaire est défini de manière à être supérieur au nombre de spires dans l'enroulement secondaire. Le nombre de spires dans le second enroulement primaire est défini de manière à être supérieur au nombre de spires dans l'enroulement secondaire.
PCT/JP2020/006386 2019-02-22 2020-02-19 Circuit de filtre d'interférence électromagnétique WO2020171095A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2021502057A JP7103505B2 (ja) 2019-02-22 2020-02-19 電磁干渉フィルター回路

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910135279.7A CN111614094B (zh) 2019-02-22 2019-02-22 电磁干扰滤波电路
CN201910135279.7 2019-02-22

Publications (1)

Publication Number Publication Date
WO2020171095A1 true WO2020171095A1 (fr) 2020-08-27

Family

ID=72143962

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/006386 WO2020171095A1 (fr) 2019-02-22 2020-02-19 Circuit de filtre d'interférence électromagnétique

Country Status (3)

Country Link
JP (1) JP7103505B2 (fr)
CN (1) CN111614094B (fr)
WO (1) WO2020171095A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023127445A1 (fr) * 2021-12-28 2023-07-06 株式会社豊田自動織機 Dispositif d'alimentation électrique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004180497A (ja) * 2002-11-18 2004-06-24 Power Integrations Inc 電源の入力ｅｍｉフィルタリングを行う方法および装置
US6898092B2 (en) * 2003-06-25 2005-05-24 Picor Corporation EMI filter circuit
JP2016516318A (ja) * 2013-02-13 2016-06-02 ヴァレオ システム ドゥ コントロール モトゥール 電磁干渉をフィルタリングするためのデバイス及び方法
JP2017038500A (ja) * 2015-08-12 2017-02-16 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． 伝導性ノイズ抑制回路及びインバータ装置
JP2018157747A (ja) * 2017-03-17 2018-10-04 シャフナー・エーエムファウ・アクチェンゲゼルシャフト アクティブフィルタ

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101458284A (zh) * 2008-12-30 2009-06-17 南京师范大学 传导性电磁干扰噪声的共模噪声和差模噪声分离器
KR101598259B1 (ko) * 2013-12-30 2016-02-26 강원대학교산학협력단 Emi필터 장치 및 그 동작방법
US10177702B2 (en) * 2015-08-12 2019-01-08 Samsung Electronics Co., Ltd. Conduction noise filtering circuit, inverting device, and compressor
KR101939784B1 (ko) 2017-09-22 2019-01-18 한밭대학교 산학협력단 Dash Camera의 EMI 대응 보드

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004180497A (ja) * 2002-11-18 2004-06-24 Power Integrations Inc 電源の入力ｅｍｉフィルタリングを行う方法および装置
US6898092B2 (en) * 2003-06-25 2005-05-24 Picor Corporation EMI filter circuit
JP2016516318A (ja) * 2013-02-13 2016-06-02 ヴァレオ システム ドゥ コントロール モトゥール 電磁干渉をフィルタリングするためのデバイス及び方法
JP2017038500A (ja) * 2015-08-12 2017-02-16 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． 伝導性ノイズ抑制回路及びインバータ装置
JP2018157747A (ja) * 2017-03-17 2018-10-04 シャフナー・エーエムファウ・アクチェンゲゼルシャフト アクティブフィルタ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023127445A1 (fr) * 2021-12-28 2023-07-06 株式会社豊田自動織機 Dispositif d'alimentation électrique

Also Published As

Publication number Publication date
JPWO2020171095A1 (ja) 2021-12-02
JP7103505B2 (ja) 2022-07-20
CN111614094A (zh) 2020-09-01
CN111614094B (zh) 2023-08-18

Similar Documents

Publication Publication Date Title
US7403403B2 (en) Noise suppressor
US7199692B2 (en) Noise suppressor
US7193869B2 (en) Noise suppressor
US20070252664A1 (en) Noise Suppression Circuit
WO2020171095A1 (fr) Circuit de filtre d'interférence électromagnétique
JP4290669B2 (ja) ノイズ抑制回路
JP2004297551A (ja) ノイズフィルタ装置及びスイッチング電源装置
JP4424476B2 (ja) ノイズ抑制回路
JP2004080436A (ja) コモンモード信号抑制回路
Kim et al. A new asymmetrical winding common mode choke capable of attenuating differential mode noise
CN109639128B (zh) 优化变压器结构以降低反激式开关电源传导共模干扰的方法
JP2004356918A (ja) ノイズ抑制回路
JP4275034B2 (ja) ノイズ抑制回路
CN216437057U (zh) 一种能对电力线进行信息泄漏抑制的电源滤波电路
US9948004B2 (en) Hybrid coil circuit
JP2005117218A (ja) ノイズ抑制回路
JPH06311749A (ja) スイッチング電源装置
CN217824765U (zh) 用在梯度功率放大器中的输出滤波器
JP4290643B2 (ja) フィルタ回路
JP7425727B2 (ja) Ｌｃフィルタ配置、及びこのようなｌｃフィルタ配置を有する電気又は電子デバイス
CN113691121B (zh) 滤波板和烹饪设备
CN215871185U (zh) 一种开关电源端口传导噪声自动检测对消电路
CN221748205U (zh) 一种有源无源混合模式emi滤波器
WO2023276459A1 (fr) Circuit inducteur
CN210183297U (zh) 一种低频段滤波装置及电器设备

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20759104

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021502057

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20759104

Country of ref document: EP

Kind code of ref document: A1